[PATCH net-next] ipv6: use jhash2() in rt6_exception_hash()

[PATCH net-next] ipv6: use jhash2() in rt6_exception_hash()

[Eric Dumazet]

Faster jhash2() can be used instead of jhash(), since
IPv6 addresses have the needed alignment requirement.

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 net/ipv6/route.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a63ff85fe14198fc23a5cbc7abcd107df5df00c8..c7a2022e64eb9de9e4300f0311dbff66281ec0a8 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1475,11 +1475,11 @@ static u32 rt6_exception_hash(const struct in6_addr *dst,
 	u32 val;
 
 	net_get_random_once(&seed, sizeof(seed));
-	val = jhash(dst, sizeof(*dst), seed);
+	val = jhash2((const u32 *)dst, sizeof(*dst)/sizeof(u32), seed);
 
 #ifdef CONFIG_IPV6_SUBTREES
 	if (src)
-		val = jhash(src, sizeof(*src), val);
+		val = jhash2((const u32 *)src, sizeof(*src)/sizeof(u32), val);
 #endif
 	return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
 }
-- 
2.24.0.rc1.363.gb1bccd3e3d-goog

Re: [PATCH net-next] ipv6: use jhash2() in rt6_exception_hash()

[David Miller]

From: Eric Dumazet <edumazet@google.com>
Date: Sun,  3 Nov 2019 18:24:16 -0800

> Faster jhash2() can be used instead of jhash(), since
> IPv6 addresses have the needed alignment requirement.
> 
> Signed-off-by: Eric Dumazet <edumazet@google.com>

Applied, thanks.